package com.shen.my_blog.handler;


import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.shen.my_blog.dao.pojo.SysUser;
import com.shen.my_blog.service.LoginService;
import com.shen.my_blog.utils.UserThreadLocal;
import com.shen.my_blog.vo.ErrorCode;
import com.shen.my_blog.vo.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.HandlerMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.logging.Handler;


@Component
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private LoginService loginService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /**
         * 1。判断是不是HandlerMethod（Controller方法）
         * 2、判断token是否为空  如果为空  未登录
         * 3、如果token不为空 验证登录loginService
         * 4、如果认证成功 通过
         */
        if (!(handler instanceof HandlerMethod)){
            return true;
        }
        String token = request.getHeader("Authorization");
        log.info("=================request start===========================");
        String requestURI = request.getRequestURI();
        log.info("request uri:{}",requestURI);
        log.info("request method:{}",request.getMethod());
        log.info("token:{}", token);
        log.info("=================request end===========================");
        if (StringUtils.isBlank(token)){
            Result result = Result.fail(ErrorCode.NO_LOGIN.getCode(), "未登录");
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().print(JSON.toJSONString(result));
            return false;
        }
        SysUser sysUser = loginService.checkToken(token);
        if (sysUser == null){
            Result result = Result.fail(ErrorCode.NO_LOGIN.getCode(), "未登录");
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().print(JSON.toJSONString(result));
            return false;
        }

        //在controller中直接获取用户的信息
        UserThreadLocal.put(sysUser);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //如果不删除 ThreadLocal会有内存泄露的风险
        UserThreadLocal.remove();
    }
}
